Dev Tips

#!/bin/bash
FILES=/home/rafal/Pictures/Mockba/*
for f in $FILES
do
    echo “resize $f “
    cp $f $f”.bak”
    mogrify -resize 50%  $f
done 

— to debug POP3 —
# telnet x.x.x.x 110
user USERNAME
pass PASSWORD
stat
quit

— to debug IMAP —
# telnet x.x.x.x 143
a login USERNAME PASSWORD
a examine inbox
a logout

— to debug POP3 over SSL —
# openssl s_client -connect x.x.x.x:995
(then use same commands as POP3 example)

— to debug IMAP over SSL —
# openssl s_client -connect x.x.x.x:993
(then use same commands as IMAP example)

[root@hostname ~]# /etc/init.d/amavisd start
Starting Mail Virus Scanner (amavisd): fetch_modules: error loading required module Compress/Zlib.pm:
  dualvar is only available with the XS version of Scalar::Util at /usr/lib/perl5/site_perl/5.8.8/Compress/Zlib.pm line 8
  BEGIN failed—compilation aborted at /usr/lib/perl5/site_perl/5.8.8/Compress/Zlib.pm line 8.
  Compilation failed in require at /usr/sbin/amavisd line 197.
ERROR: MISSING REQUIRED BASIC MODULES:
  Compress::Zlib
BEGIN failed—compilation aborted at /usr/sbin/amavisd line 237

SOLUTION:

perl -MCPAN -e "CPAN::Shell->force(qw(install Scalar::Util));"

Create iso file from cd drive:

 dd if=/dev/cdrom of=/home/user/cd.iso 

Create iso file from cd drive:

dd if=/dev/dvd of=/home/user/dvd.iso 

Create iso file from scsi cd drive:

dd if=/dev/scd0 of=/home/user/cd.iso 

Mount  iso file  and unmount :

mount -o loop -t iso9660 /home/user/cd.iso /mnt/dir_for_mount 

umount -lf /mnt/dir_for_mount 

 #!/bin/bash

logfile=”/home/user/db_backups/pgsql.log”
backup_dir=”/home/user/db_backups”
touch $logfile
databases=`psql -h localhost -U postgres -q -c “\l” | sed -n 4,/\eof/p | grep -v rows\) | grep -v template0 | grep -v template1 | awk {‘print $1’}`

echo “Starting backup of databases ” » $logfile
for i in $databases; do
 dateinfo=`date ‘+%Y-%m-%d %H:%M:%S’`
 timeslot=`date ‘+%Y%m%d%H%M’`
 /usr/bin/vacuumdb -z -h localhost -U postgres $i >/dev/null 2>&1
 /usr/bin/pg_dump -U postgres —inserts $i -h 127.0.0.1 -f $backup_dir/$i-database-$timeslot.backup 
 echo “Backup and Vacuum complete on $dateinfo for database: $i ” » $logfile
done

In /root  You should  have .pgpass file  with chmod 600

cat /root/.pgpass 

*:*:*:postgres:password_for_postgres_user 

mysqldump -u root -pMyPassword —all-databases | gzip > /path/to/file/mysql.sql.gz 

UPDATE mysql.user SET Password=PASSWORD(‘myNewPassword’) WHERE User=’root’;
FLUSH PRIVILEGES;

echo “This is the message body” | mutt -a file_attach.zip -s “subject of message” recipient@domain.com

1. http://www.barrgroup.com/Embedded-Systems/How-To/Embedded-Java

2.http://www.youtube.com/watch?v=mdHCWPZ-kbQ&feature=BFa&list=PL62BE418C34C3B2BD

3.http://www.javaworld.com/javaworld/jw-09-1996/jw-09-ripps.html